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cdpuk / givenergy-local

Home Assistant integration for local access to GivEnergy inverter and battery systems
MIT License
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Different battery voltage shown in GE app compared to integration #16

Closed ianfretwell closed 1 year ago

ianfretwell commented 1 year ago

I have a Giv-Bat 5.2 (80% DOD) with firmware 3009.

Currently the integration is showing battery voltage as 52.016v (with battery charge as 16% & battery percent as 5%)

by comparison the GE app is (with a working local connection) showing:-

50.91v and also a battery percent of 5%.

Why the difference ?

cdpuk commented 1 year ago

Thanks for the report - well spotted.

The reason for the discrepancy is that the voltage currently reported in HA is from the BMS, whereas the voltage you see in the app is as the inverter sees it. The difference in the percentage charge sensors is caused by the same thing - you'll see one entity is provided by the Inverter device and the other provided by the Battery device.

I think the answer will be to represent both values for the battery voltage, like we currently do for the charge percent. The app is not displaying all available values - much more is available when querying the devices at a low level.

As for the reason behind the differences - I can't answer that. That's down to how GivEnergy design their hardware and write their firmware.

ianfretwell commented 1 year ago

Cheers for the explanation!